JP2002070637A - Data recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data recorder capable of certainly and efficiently recording data used for investigation or the like of the cause or the like of a failure or a breakdown of a controller by effectively applying the limited storage capacity of a data recording part. SOLUTION: In this driving recorder 6 (data recorder), when a control unit 5 of an automobile fails or has the breakdown, a failure code output signal is triggered, and detection signal data before then is stored in the data recording part 21 of the driving recorder 6. A storage period or a sampling rate of the stored data is changed according to the content of the failure or the breakdown of the control unit 5, a vehicle state, or the storage capacity of the data recording part 21. Thereby, the limited storage capacity of the data recording part 21 is effectively applied, and the data used for the investigation or the like of the cause or the like of the failure or the breakdown of the control unit 5 is certainly and efficiently recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data storage unit which stores various data on an electronic control device, for example, when a control unit or the like mounted on an automobile fails or malfunctions. The present invention relates to a data recording device capable of reliably collecting and recording data while effectively utilizing the limited storage capacity of the data recording device.

[0002]

2. Description of the Related Art In recent years, an electronic control device using a microcomputer or the like has been widely used as a control device for a device to be controlled (for example, an automobile) requiring some control. However, in such an electronic control device, a failure (malfunction) or a failure sometimes occurs. Therefore, in many cases, a data recording device is used to record various data output from the control device, and based on this data, the cause of the failure or failure of the control device is determined (for example, special features). See JP-A-11-65647.)

Specifically, for example, in an automobile manufacturer,
Equipped with a driving recorder in a car, various data output from a control unit that controls an engine or an automatic transmission, etc. are recorded in the driving recorder, and based on the data, a cause of a failure or failure of the control unit is determined. A response has been made. In the control device (programmable controller) disclosed in JP-A-11-65647,
When the failure occurs, the failure history is recorded on a PC card.

[0004]

However, in such a conventional data recording apparatus, although a very large amount of data must be recorded, the storage capacity of the data recording section is limited. However, there is a problem that it is difficult to reliably record the data. The present invention has been made in order to solve the above-mentioned conventional problems, and is used to determine the cause of a failure or failure of a control device by effectively utilizing the limited storage capacity of a data recording unit. It is an object of the present invention to provide a data recording device capable of reliably and efficiently recording data to be recorded.

[0005]

SUMMARY OF THE INVENTION The data recording apparatus according to the present invention, which has been made to solve the above-mentioned problems, is intended to be used when a target control device (for example, a control unit of an automobile) malfunctions (fails) or fails. What is claimed is: 1. A data recording apparatus comprising: a data control unit for storing various detection signal data in a data recording unit (memory), wherein the data control unit is configured to perform a malfunction (e.g., sudden change, Etc.), the sampling rate (sampling cycle) or the storage period of the data to be stored is changed. The data control means may change a sampling rate or a storage period of data to be stored according to a vehicle state (for example, engine speed, vehicle speed). Further, the data control means may change the sampling rate or the storage period of the data to be stored according to the storage capacity (remaining storage capacity) of the data recording unit.

[0006] In these data recording devices, the sampling rate or the storage period of the data to be stored is changed according to the content of the malfunction or failure of the target control device, the vehicle state, or the storable capacity of the data recording unit. Therefore, by effectively utilizing the limited storage capacity of the data recording unit, it is possible to reliably and efficiently record data used for determining the cause of a malfunction or failure of the control device.

In the above data recording apparatus, the data control means stores various detection signal data in a random access memory (hereinafter, referred to as "RAM") while sequentially updating and storing the data, while thinning out the data stored in the RAM. Alternatively, the sampling rate may be changed by recording (compressed) in the data recording unit.

In the above data recording apparatus, the data control means estimates the type of malfunction or failure expected from the various detection signal data, and changes the sampling rate or the storage period according to the type of malfunction or failure expected. You may be able to. The data control means may change the sampling rate or the storage period for each type of the detection signal data.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below. In this embodiment, a case where data of a control unit of a vehicle is collected and recorded will be described as an example.However, the application field of the data recording device according to the present invention is not limited to the control unit of a vehicle. Of course, the data recording device can be widely applied to various electronic control devices.

As shown in FIGS. 1 and 2, an automobile 1 (experimental vehicle) includes a control unit 5 (ECU) having a microcomputer for controlling an engine 2, an automatic transmission 3, and the like. Is provided. In addition, electric power is supplied from the battery 4 to various electric devices in the automobile 1. The control unit 5 is provided in the car 1.
A driving recorder 6 for recording various output signal data of the control unit 5 is mounted in order to investigate the cause of a failure (malfunction) or a failure of the control unit 5.
The driving recorder 6 is connected via a power cable 7
Backup power supply terminal 11 of control unit 5
(ACC).

Further, the driving recorder 6 is connected to the control unit 5 via a connection harness 8. The connection harness 8 includes a vehicle harness 8a having a distal end connected to various devices (such as an actuator) in the engine 2 or the automatic transmission 3, and an intermediate harness 8b connecting the vehicle harness 8a and the control unit 5.
And a branch harness 8c branched from the intermediate harness 8b and connected to the driving recorder 6. The driving recorder 6 is connected to the host computer 10 using the collected data transfer cable 9 as needed.
(Personal computer). That is, the driving recorder 6 and the host computer 10 perform serial communication via the collected data transfer cable 9. The driving recorder 6 and the host computer 10
Means that information can be transmitted and exchanged using the RAM card 12 as indicated by a double arrow X.

Hereinafter, the configuration, functions, and the like of the driving recorder 6 will be described in detail. The driving recorder 6 reliably collects and records various signal data at the time of a failure or failure of the control unit 5. According to the failure code output signal output from the control unit 5, the driving recorder 6 performs the operation before the failure or the failure. Before or in some cases, various signal data after a failure or after a failure can be reliably recorded. Further, as will be described in detail later, the driving recorder 6 changes the data recording method according to the content of the failure or failure of the control unit 5, the vehicle state, the storage capacity of the data recording unit, and the like.

As shown in FIG. 3, the driving recorder 6 includes a central processing unit 15 (CPU) for controlling the entire driving recorder, and various output signals (for example, an engine speed signal,
A throttle opening signal, a vehicle speed signal, a cooling water temperature signal, a brake switch signal, etc.), and an input interface (I / F) unit 16 for performing input level conversion and filtering on these signals, and a fault output from the control unit 5. A malfunction / failure detection unit 17 for receiving a code output signal and detecting the content (state) of a failure or failure of the control unit 5, and accepting various operation switch signals output from an operation switch (SW) group 18 for these commands The central processing unit 15 (C
An operation switch processing unit 19 for outputting data to the PU, an SRAM 20 for storing constantly sampled data, and a data recording unit 21 (non-volatile memory, for example, EEPROM) for recording sampling data are provided.
In order to make the RAM card 12 (flash memory: see FIG. 2) detachable,
AM card slot is provided and RAM card 1
2 can store data.

The driving recorder 6 is simple, compact, and highly reliable. That is, the driving recorder 6 is, for example, 250 mm
It is of a compact size of about 245 mm x 100 mm, and it is also possible to stack and use several units. Therefore, the driving recorder 6 is of a size that can be mounted on a durable vehicle from the beginning, and its reliability is extremely high, and the same reliability as the control unit 5 is secured. As described above, the driving recorder 6 can be extremely easily connected to the automobile 1 using the power cable 7 and the branch harness 8c.

The operation of the driving recorder 6 is extremely simple, so that anyone can use it easily. That is, the driving recorder 6 is an ignition switch (not shown) of the automobile 1.
When is turned on, measurement starts automatically. However, it is also possible to start the measurement manually. On the other hand, when the ignition switch is turned off, the mode is switched to the sleep mode four minutes later, thereby saving power.
Then, when the trigger condition is satisfied, that is, when the failure code output signal is input, the measurement is stopped. However, the measurement can be stopped by a switch operation.

Thus, the driving recorder 6 can reliably collect and record data when the trigger condition is satisfied, that is, when the control unit 5 fails or fails. The driving recorder 6 can sample, for example, data of 16 channels at a high speed, and can measure almost all input / output signals (16 types / units) of the control unit 5. Then, using the failure code output signal as a trigger, various data for 1 to 4 minutes before that are measured. Even if no fault code output signal is input,
The trigger can be activated by pressing the manual switch. Further, in the driving recorder 6, data processing is extremely simple. For example, various data can be stored in the RAM card 12 (flash card) by a switch operation, and data can be exchanged with the RAM card 12. Further, these data can be analyzed on a Windows (registered trademark) screen of the host computer 10.

In addition, the driving recorder 6 is very simple to use or operate. The outline of the operation method of the driving recorder 6 is as follows. (1) First, the operating conditions of the driving recorder 6 are set. When installing by serial communication with the host computer 10, a sampling rate, a trigger mode, a signal name of each measurement channel, a comment, and a time are set. The sampling rate is, for example, 0.1 m
s, 1 ms or 10 ms. The trigger mode includes a control mode of the control unit 5, a trigger inhibition time (for example, 10 m) after the ignition switch is turned on.
s, 20 ms, 30 ms) and the like (for example,
9 types) are set. When operating conditions are set by the switches of the driving recorder 6, the sampling rate (for example, 0.1 ms, 1 ms, 10 ms) and
The logic inversion switch of the trigger signal to the driving recorder 6 is set, and the input gain of the channel 1 is changed.

(2) Next, data sampling is started. Data sampling is started manually by turning on a sampling start switch (not shown) attached to the driving recorder 6 or automatically by turning on an ignition switch.

(3) Thus, the control unit 5
When a failure or failure occurs in the above, data sampling is stopped. Data sampling is stopped manually by turning on a sampling stop switch (not shown) attached to the driving recorder 6, or automatically by input of a failure code output signal. If data sampling is stopped by mistake, the sampling stop switch is set for a certain period of time (for example, 5 minutes).
If pressed for more than a second), sampling will be possible again.

(4) The sampled data is recorded in the data recording section 21. Note that the sampled data can be recorded on the RAM card 12 at any time. In this case, the RAM card 12 is inserted into the RAM card slot, the RAM card write switch (not shown) is turned on, and the data is stored in the RAM card 12 (the RAM card 12 is not inserted into the slot while the automobile is running). Is preferred.). When the data writing to the RAM card 12 is completed, the data inside the driving recorder 6 is cleared. However, if the data writing is not completed normally, the measurement data will not be cleared.

Hereinafter, a specific method of collecting and recording data in the driving recorder 6 will be described. The principle of data collection in the driving recorder 6 is approximately as follows. Here, for convenience, it is assumed that the storage capacity is 80 MB (megabyte). As shown in FIG. 4, when the control unit 5 is in the on state (when the power is turned on), sampling of various data is always performed. The data sampling start point R ₁ is when the control unit 5 is turned on. Since the storage capacity is 80MB, 80M
When data exceeding B is sampled, old data is sequentially deleted, and the latest data of 80 MB is always stored.

[0022] Then, when an abnormality is detected in any detection means, i.e. the trigger points R _2, sampling of the various types of data is stopped, it previously sampled data written in the nonvolatile memory (data recording unit) It is. Here, the write size of data to the nonvolatile memory in the first trigger point R ₂ are all samples (80MB) to endpoint. However, when the start point R ₁ to the end point R ₃ are smaller than the total memory capacity (80 MB), the data write size is from the start point R ₁ to the end point R ₃
It is the amount of data between.

FIG. 5 shows an example of the data collected and recorded in this way and the analysis results. In FIG. 5, an analog engine speed signal input to the control unit 5 from an engine speed sensor (not shown), and SGC is input to the control unit 5 from a cylinder identification sensor (not shown). This is an analog cylinder identification signal. And NE ⁺ PCM and SGC PCM
Are an engine speed signal and a cylinder identification signal generated (output) by the control unit 5 based on the analog engine speed signal NE ⁺ and the analog cylinder identification signal SGC, respectively. In the example shown in FIG. 5, the control unit 5 transmits the analog cylinder identification signal SGC
, The cylinder is erroneously detected (cylinder identification error). That is, in the cylinder identification signal SGC PCM generated by the control unit 5, the cylinder erroneous detection unit P is recognized. As described above, by analyzing the data recorded in the driving recorder 6, the cause of the failure or failure of the control unit 5 can be determined.

Hereinafter, a specific operation of the driving recorder 6 will be described. In the driving recorder 6, a failure code output signal output from the control unit 5 is used as means for detecting a failure or failure of the control unit 5. Further, details of the failure or failure of the control unit 5 and the vehicle 1
The data recording method is changed according to the vehicle information, the driving state of the automobile 1, the remaining storage capacity of the data recording unit 21, and the like.

More specifically, the detection of the failure or the content of the failure of the control unit 5 is performed by a failure code output signal output from the control unit 5. The failure code output signal is output in accordance with the failure code recorded in the control unit 5 in advance, according to the failure or the location of the failure or the content of the failure or failure.

Table 1 shows the contents of the failure or failure.
An example of a correspondence relationship with a failure code is shown.

[Table 1] Table 1 Correspondence between failure contents and failure codes

The driving state of the vehicle 1 is detected by the driving recorder 6 based on various output signals of the control unit 5. In particular,
In this embodiment, the operating state of the automobile 1 is detected based on signals such as an engine speed signal, a throttle opening signal, a vehicle speed signal, a coolant temperature signal, and a brake switch signal. Data recording unit 21 of driving recorder 6
The storable capacity of the (recording memory) is confirmed by checking the remaining capacity of the data recording unit 21 where data can be written in the driving recorder 6. The vehicle information of the automobile 1 is input by transmitting a vehicle code from the operation switch group 18 to the operation switch processing unit 19.

In this embodiment, data recording is performed in accordance with a failure code corresponding to the content of a failure or a failure, the operating state of the automobile 1, and the remaining capacity of the data recording unit 21 (recording memory) of the driving recorder 6. The method is changed. Here, as a method of changing the data recording method,
For example, there are a method of changing the data recording capacity, a method of changing the data sampling rate, a method of changing the data recording timing, a method of compressing and recording data (decimating data) according to the remaining capacity of the recording memory, and the like. The points of each of these change methods are as follows.

In the case of changing the data recording capacity The data recording capacity is changed depending on the failure code. For example, for critical failures or failures such as engine stalls, engine misfires, vehicle speed sensor failures, or failures or failures that lead to violations of regulations, the maximum recordable data is recorded so that subsequent cause analysis can be performed in detail. You. In the case of a relatively low failure rank such as a failure or failure of a water temperature sensor or a brake switch, data having a capacity of about 1/2 to 1/10 of the maximum recordable capacity is recorded according to the rank. It is possible to record data on a large number of failures or failures. In the contents of the failure or the failure described in Table 1, the smaller the failure code number, the higher the failure rank (priority).

In the case of changing the data sampling rate The data sampling rate is changed depending on the failure code and the operating state. For example, for engine stalls and engine misfires, noise and signal waveforms can be analyzed.
The sampling rate is set to the maximum (high speed). Further, regarding the failure or failure of the engine speed signal or the vehicle speed signal, the sampling rate is changed depending on the engine speed at the time of occurrence of the failure or the failure or the frequency of the vehicle speed signal in order to facilitate subsequent analysis of the cause. In addition, the sampling rate of a signal whose fluctuation is relatively slow, such as a water temperature signal or a brake switch failure or failure, is set to a minimum (low speed) in order to enable data recording of a large number of failures or failures. You.

In the case of changing the data recording timing The data recording timing is changed according to the failure code. For example, if an engine misfire or a failure or failure of the water temperature sensor occurs, subsequent control becomes unstable.
As a result, in the case of violating emission regulations or the like, data after failure or failure becomes important.
In such a case, data is collected and recorded so that the timing at which a failure or failure occurs is at the center of the recording data length. Also, for information in which information before the failure or after the failure, such as a failure of the crank sensor, the vehicle speed sensor, the brake switch, etc., is more important than the information after the failure, the timing when the failure or the failure occurs is determined by the recording data length. Data is collected and recorded at the end (data before the occurrence of a failure or failure is recorded).

In the case of data compression recording (data thinning) in accordance with the remaining capacity of the recording memory, etc. When a failure or failure occurs, the capacity of data to be recorded exceeds the remaining capacity of the data recording unit 21 (memory) (capacity). (Insufficient), the data is thinned out stepwise according to the capacity shortage so that the data can be recorded in the remaining capacity. In this embodiment, the data recording method based on the vehicle information is changed. However, priority may be given to the above according to the vehicle information.

The sampling rate (sampling period) of the driving recorder 6 is determined by the content of the failure or failure of the control unit 5 and the vehicle 1
Of the vehicle 1, the operating state of the automobile 1, the type (type) of the control unit 5, and the contents of the expected failure or failure. As a result, more reliable data collection becomes possible, and the data recording unit 21 (recording memory) can be effectively used.

The mode of the control unit 5 and the vehicle information are determined by operating the operation switch group 18 by the user.
By inputting the preset format of the control unit 5 and each code of the vehicle information, it is recorded in the driving recorder 6. The method of detecting the driving state of the vehicle 1 is as described above. The content of the expected failure or failure is predicted based on various output signals input to the input interface unit 16. This prediction is
For example, the following procedure is performed. (I) Detect a signal input to the input interface unit 16. (Ii) A fail or failure content set in advance is set based on a priority order according to a combination of input signals. (Iii) A user inputs a failure code set in advance by operating the operation switch group 18. In this way,
Predicted failure contents are registered inside the driving recorder 6.

The sampling rate can be changed, for example, by the control unit, by the vehicle information of the vehicle 1, by the operating condition of the vehicle 1, or by an anticipated failure or failure. And the like to be changed. The points of each of these change methods are as follows.

In the case of changing by the control unit Although the control cycle is individually set by the control unit 5, the sampling rate is changed according to the control cycle. The sampling rate can be selected to be one time, two times, or four times the control cycle.

When Changing Based on Vehicle Information The sampling rate is changed according to vehicle information set by a user operation. For example, the sampling rate is set high (high speed) for a model equipped with a high-speed engine or a model having a high maximum speed so that no data is missed. On the other hand, the sampling rate is set low (low speed) for a vehicle type having a low engine speed or a vehicle type having a low maximum speed.

In the case of changing according to the driving state of the vehicle, the engine speed signal, the throttle opening signal, the vehicle speed signal,
The sampling rate is changed according to the operating state of the automobile 1 detected based on a signal such as a cooling water temperature signal and a brake switch signal. For example, when the engine speed is high or the vehicle speed is high, the fluctuation frequency of the engine speed signal, the vehicle speed signal and the like is high, and when the engine speed is low or the vehicle speed is low, the reverse is true. Therefore, by performing sampling in synchronization with changes in the engine speed signal and the vehicle speed signal, the subsequent data analysis is facilitated.

In the case of changing according to the content of the expected failure or failure, the sampling rate is changed according to the content of the expected failure or failure, and detailed data is reliably recorded when a failure or failure occurs. It should be noted that priorities may be assigned to the above-mentioned change methods.

The driving recorder 6 saves the data to be recorded by dividing the data to be recorded into a plurality of data according to the failure or failure state of the control unit 5 for each data collection system or every predetermined time. The security (preservability) of the data that has been obtained is enhanced. That is, the driving recorder 6 reads the output pattern of the fault code output signal output from the control unit 5 and
Is detected or a failure state (failure code) is detected, and the number of divisions of the stored data is changed accordingly. For example, the higher the priority order corresponding to the fault codes shown in Table 1, the greater the number of divisions.

Specifically, by operating the operation switch,
The stored data can be written for each data collection channel or for a predetermined time (time axis). For example, as shown in FIG. 6, by dividing and writing a file for each channel, it is possible to prevent the file from being totally damaged due to a defect or damage of the storage medium used as the data recording unit 21. That is, it is possible to minimize the influence of the failure or damage of the recording medium. Also, as shown in FIG. 7, by writing the file by dividing it on the time axis, similarly, it is possible that the file is completely damaged due to the defect or damage of the storage medium used as the data recording unit 21. Is prevented.

Hereinafter, a specific operation or control method of the driving recorder 6 will be described with reference to flowcharts shown in FIGS. As shown in FIG.
When the driving recorder 6 starts operation, first, in step T10, it is determined whether or not a storage start command is present. If there is no storage start command (NO), all the following steps are skipped and step T10 is repeatedly executed. . That is, it waits until a storage start command is issued.
On the other hand, if it is determined in step T10 that there is a storage start command (YES), a temporary storage routine is executed in step T20, and then a storage routine is executed in step T30.

Next, each of the above routines (Step T20,
A specific operation or control method in T30) will be described. As shown in FIG. 8B, in the temporary storage routine in step T20, in step T21, various input signals or control signals or output signals (hereinafter, referred to as "signal data") received in step T21 have a predetermined capacity. (For example, 80 MB) is temporarily stored in the SRAM 20.
When the signal data exceeds the above capacity, it is updated and recorded from the old signal data.

As shown in FIG. 8C, step T30
In the storage routine of (1), first, in step T31, it is determined whether or not a warning lamp (not shown) is turned on. If the warning lamp is not turned on (NO),
This storage routine ends, skipping all the following steps.

On the other hand, if it is determined in step T31 that the warning lamp is lit (YES), in step T32, a disconnection check confirmation subroutine is executed, and the lighting of the warning lamp is based on the disconnection check. Whether or not is examined. In addition, the check for core breakage
When the ignition switch is turned on, the warning lamp is unconditionally turned on for a predetermined time so that the driver can check whether the warning lamp is disconnected. Next, in step T33, it is determined whether or not the lighting of the warning lamp is the lighting by checking the core breakage. Then, if the light is turned on by the disconnection check (YES), the storage routine ends.

On the other hand, if it is determined in step T33 that the light is not turned on by the disconnection check (NO),
At 34, a selection subroutine is executed. The specific contents of the selection subroutine will be described later (FIGS. 9A to 9A).
(D)). Next, in step T35, the selected storage content is stored in the data recording unit 21 (non-volatile memory, for example, EEP).
ROM), and the storage routine ends.
In this way, the cause of the failure or failure of the control unit 5 is determined based on the data recorded in the data recording unit 21.

Hereinafter, referring to FIGS. 9A to 9D,
Four specific control methods of the selection subroutine of step T34 in FIG. 8C will be described (selection subroutines 1 to 4). As shown in FIG. 9A, in the case of the selection subroutine 1, first, in step V11, the content of the failure or failure of the control unit 5 is detected.
Subsequently, in step V12, a sampling rate or a storage period is set for each of various input signals or control signals according to the content of the failure or the content of the failure. Thereafter, in step V13, the content to be stored in the data recording unit 21 is selected based on the sampling rate or the storage period.

As shown in FIG. 9B, in the case of the selection subroutine 2, first, at step V21, the contents of a failure or the contents of a failure are estimated by various input signals or control signals. Subsequently, in step V22, a sampling rate or a storage period is set for each of the various input signals or control signals in accordance with the inferred content of the failure or the content of the failure. Thereafter, in step V23, based on the sampling rate or the storage period, the data recording unit 21
Is selected.

As shown in FIG. 9C, in the case of the selection subroutine 3, first, at step V31, the vehicle state (for example, vehicle speed, engine speed, etc.) is detected. continue,
In step V32, a sampling rate or a storage period is set for each of various input signals or control signals according to the detected vehicle state. Thereafter, in step V33,
The contents to be stored in the data recording unit 21 are selected based on the sampling rate or the storage period.

As shown in FIG. 9D, in the case of the selection subroutine 4, first in step V41, the data recording unit 2
The remaining memory capacity within 1 is detected. Subsequently, in step V42, the frequency of failure or failure is detected.
Next, in step V43, the remaining memory capacity is corrected according to the frequency of failure or failure. Then, in step V44, a sampling rate or a storage period is set for each of various input signals or control signals according to the corrected remaining memory capacity. Thereafter, step V45
Then, the content to be stored in the data recording unit 21 is selected based on the sampling rate or the storage period.

As described above, in the present embodiment, when the control unit 5 fails or fails, the failure code output signal is used as a trigger to store the previous detection signal data in the data recording unit 21. Further, since the sampling rate or the storage period of the data to be stored is changed according to the content of the failure or failure of the control unit 5, the vehicle state, or the storable capacity of the data storage unit 21, the data storage unit 21 is limited. By effectively utilizing the storage capacity, the data used for investigating the cause of the failure or failure of the control unit 5 can be reliably and efficiently recorded.

[Brief description of the drawings]

FIG. 1 is an explanatory side view of an automobile equipped with a driving recorder according to the present invention.

FIG. 2 is a schematic diagram showing a connection form of a driving recorder to a control unit and a host computer.

FIG. 3 is a block diagram illustrating a configuration of a driving recorder.

FIG. 4 is a diagram showing a principle of collecting data in an SRAM in a driving recorder.

FIG. 5 is a graph showing an example of data collected and recorded by a driving recorder when a control unit fails or fails.

FIG. 6 is a diagram showing a data recording mode when a file is divided and recorded for each channel in a data recording unit.

FIG. 7 is a diagram showing a data recording mode when a file is divided and recorded on a time axis in a data recording unit.

8A is a flowchart showing a control method of a main control routine in the driving recorder, FIG. 8B is a flowchart showing a control method of a temporary storage routine in the main control routine, and FIG. 9 is a flowchart illustrating a control method of a storage routine during the routine.

9 (a) to 9 (d) are flowcharts each showing a control method of a selection subroutine in the storage routine shown in FIG. 8 (c).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Car, 2 ... Engine, 3 ... Automatic transmission, 4 ... Battery, 5 ... Control unit (ECU), 6 ... Driving recorder (data recording device), 7 ... Power cable, 8 ... Connection harness, 8a ... Vehicle harness , 8b: Intermediate harness, 8c: Branch harness, 9: Collection data transfer cable, 10: Host computer, 11: Backup power terminal, 12: RAM card, 15: Central processing unit (CPU), 16: Input interface unit 17 ...
Malfunction / failure detection unit, 18 ... operation switch group, 19
... Operation switch processing unit, 20 SRAM, 21 data recording unit (non-volatile memory, for example, EEPROM).

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuya Okuda ▲ Toku ▼ 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima F-term in Mazda Co., Ltd. (reference) 3G084 DA31 EA04 EB06

Claims (6)

[Claims] 1. A data recording device comprising: data control means for storing various detection signal data in a data recording unit when a target control device malfunctions or fails; A data recording apparatus characterized in that a sampling rate or a storage period of the data to be stored is changed according to the content of the malfunction or the failure. 2. A data recording device comprising data control means for storing various detection signal data in a data recording unit when a target control device malfunctions or fails, wherein said data control means is adapted to respond to a vehicle state. And changing the sampling rate or the storage period of the data to be stored. 3. A data recording device comprising data control means for storing various detection signal data in a data recording unit when a target control device malfunctions or fails, wherein said data control means is a data recording unit. A data recording apparatus, wherein a sampling rate or a storage period of the data to be stored is changed according to a storable capacity. 4. The data control means stores various kinds of detection signal data in a random access memory while sequentially updating and storing the data, while sampling the data by thinning out the data stored in the random access memory and recording the data in a data recording unit. 4. The data recording apparatus according to claim 1, wherein a rate is changed. 5. The data control means estimates a type of malfunction or failure expected from various detection signal data, and changes a sampling rate or a storage period according to the type of malfunction or failure expected. The data recording device according to claim 1, wherein 6. The apparatus according to claim 1, wherein said data control means changes a sampling rate or a storage period for each type of detection signal data. Data recording device.